First comes the floor. Foster and company brought in treehouse guru Michael Garnier. Garnier runs a sprawling “treesort” in Oregon. You could say treehouses are his life. Accurately. Dude actually owns treehouses.com. And yes, he’ll come to you.

Apply the Finish

Tucker Gorman built the structures and catwalks. He runs an outfit with partner Greg Reeb called Perspective Design/Build out of Oakland. They do everything from custom furniture to finish carpentry. They choose projects based on interest. Current interests: sick treehouses and loftworks for teensy S.F. apartments.

Make the Upgrade

The Cinder Cone team took things to eleven by adding a fully custom concrete skate bowl care of Gallagher Concrete Construction. If busted brainpans aren’t your cup of Earl Grey, you could always build, you know, a pool.